Assigkktob to bird machine co



May zo 1924. 11,494,529

R. S. CLARKE SCREEN FOR PAPER STOCK Filed Jan. 2l 1921 afferma,

Patented May 2l), 1924,

UNITED PATENT SCREEN FOR PAPER?, STCK.

Application filed January al, 19931. Serial No. 433,965.

To f/ZZ whom t may concer/n.'

Be it linoivn that l, Raten Gmane,

a citizen of the United States, residing at lValpole, in the county of Norfolk and @tate of lifassachusetts, have invented certain nen7 and useful improvements in Slcreeus for Paper Stock, of which the following is a specification. j

This invention pertains to screens for paper stock, and more particularly to rotary screens Which operate partially submerged in the stock run into a tank` surrounding the screen, the graded material 4passing in- Wardly of the screen and being1 discharged endivise thereof. j

The present invention has for its mainobject the provision of `nieans whereby the coarser particles or rejections7 which are present in the stock in the tank, will be gathered up, to a greater or less extent, by the rotative action of the screen and automatically discharged from the tank.

An embodiment of the invention is illustrated in the annexed drawings, Wherein,-

Fig. 1 is a longitudinal sectional elevation of the screen;` j j 2 a transverse vertical sectional vievv thereofI taken on the line ll-H of Fig. 1; and

Fig. 3 a perspective vievv of one end of the screen showing more particularly the discharge lip or flange and one end of the lifting and propelling spiral, employed to gather and move the coarser material toward theV discharge lip. j

lteferringr to the drawings, l denotes the `vat or tank to which the material is fed through the fiovv boxes 2 and 3, or ani,1 other suitable manner. The tank may be of any approved type and the main body thereof is designed to have an oscillating movement imparted thereto through an eccentric 4 connected up with vibratory mechanism denoted generally by 5 and which is of standard type and therefore need not be described in detail. Mounted vvithin the vat or tank is a screen 6, the screen being partially sul)n merged and rotated through a gear, as 7.

The construction thus far described has heretofore been employed, the action being to cause the finer material to pass in through the openings of the screens and outwardly at one end 8 thereof, the other end 9 of the screen heing closed, Impurities held back by the settle toward the drain 10,

which is provided With a suitable valve or ofttalre pipe` not shown, the doivncoming unscreened stock assisting gravity in this action. Mounted upon the exterior surface of the screen, and extending from the dis charge end toward the head 9 is a. spirally arranged 'Hight or blade, like member ll, and secured to the head t) and extending from the shaft `which supports the screen is a skimmer 4blade l2, said blade curving rearvrardly and Ainclined outwardly toward its outer end` as it approaches the adjacent end of the flight or spiral blade ll. As Will be seen upon reference to lig. 3 the outer end of said. skimmer blade passes the end of the spiral ll, forming, in effect, a continuation thereof. The main frame or casting member i3 adjacent the head 9 is provided with an opening ll and a downwardly inclined chute l5 is secured around said opening. An olftale trough lr6 extends from the chute and delivers the material `to a conveyor or the like which delivers it to any point Where the material passing therefrom can be reground.

In operation, and with the screen rotating in the direction of the arrovv, the coarser material or rejections are collected or gathered up by the spiral and advanced toivard the head 9 where they finally pass on to the shimmer blade 12, which lifting them throws them Vout through the opening lll into the chute The skimmer blade incre-- over tends to lift any of the heavier par 'fieles or rejections which may be floating in the mass under treatment and which are :adraiired toward the same by the spiral l1, and thus materially assists in keeping the tank free of larger particles. This removal of the screen rejections in addition to assisting the action of the screen, does avvay With the necessity of draining the tank or vat so frequently, and materially enhances the operation of the apparatus.

Vilhat is claimed is l.. ln combination with a submerged screen of: the inflow type; means associated and movable therewith for gathering the coarser particles of the stock fed to the screen propelling the same longitudinally ot the screen and discharging the same.

2. ln roinbination with a tank; a screen of the inflow type located therein; and means located enteriorly ofthe screen. for iratheri: the erlassen particles from the Mtl -spirally arranged flight running lengthwise ot the screen; and means eoacting therewith to receive the coarser particles gathered by the flight vand to discharge the same without the tank. y

5. In combination with a tank; a rotary screen ot' the inflow type located therein; a spirally arranged flight carried by the screen and ruiming lengthwise thereof upon its outer face; 'a blade like member mounted on one end of the screen.- said member extending outwardly from the axis of the screen to the adjacent end of the flight, and serving to dischargev t-he coarser` particles of the stock gathered by the Hight to a point without the tank.

6. In combination with a tank having a dischargeopening at one end at the upper portion thereof; a rotary screen of the inflowVV type mounted therein; a flight arranged spirally of the screen and movable therewith; and a blade like member secured to that head of the screen which stands next lo the discharge opening. said member curv ing rearwardly as it extends outwardly from the center ot' the head and overlapping the adjacent end of. the flight.

T. In combination with a tank having a discharge opening at one end at the upper portion thereof; a rotary screen of the inflow type mounted therein; a flight arranged spi'l'ally of the screen and movable therewith :l and a blade like member secured lo that head of' the screen which .stands next to the discharge opening. said member curving rearwardly and inclined downwardly as it extends outwardly from a point adjacent the center of the head; the outer end of the member overlapping the adjacent end of the flight.

8. In combination with a tank having n` discharge opening at one end at the upper portion thereof; a rotary screen of the in- How type mounted therein; a flight arranged spirally of the screen and movable therewith: a blade like member secured to that head of the screen which stands next to the discharge opening; said member curving rearwardly and inclined downwardly as it extends outwardly from a point adja` cent the center of the head. the outer end of the member overlapping the adjacent end ot the flight; and a chute.r the upper end whereo't terminates in line. with the dischantrel opening in the tank.

In testimony whereof I have signed my name to' this specification.

RALPH S. CLARKE. 

